Improvement in power-presses



tienta iaia C@anni @da LERT D'. HAMLIN, OF BROOKLYN, NEW YORK, ASSIGNOR TO MAYS & BLSS, OF SAME PLAGE.

Letters Patent No. 110,455,1 ated December 27, i870; antedated December22, 1870.

IMPROVEMENTl IN POWERrPRESSES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Be it known that l, ALBERT HAMLIN, of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Power-Presses, of which the following is afull, clear, and exact description, reference being had to the accompanying drawing forming part ot' this specification, and in which- Figure l represents a front elevation of a powerpress having my invention applied to it Figure 2, a sectional side View, taken as indicated by the line xx injlig. l; and

Figure 3, a similar View to tig. 2, in part, looking inl the reverse direction, and taken through the line y y in iig. l.

Figure 4 is a view, in perspective, of a lever and plug forming part of the trip-motion of the press.

Figure 5 is a sectional plan oi' the plunger or mandrel portion of the press and box through which the same operates, taken as denoted by the line s z in iig. l.

Similar letters of reference indicate corresponding parts. Y

My improvement is applicable to various kinds of power-presses, including die-presses suitable for inaking or stamping up metal articles or worlr oi ditierent sorts.

rlhe invention consists in a novel device for arresting the plunger at the top of its stroke, or when out ot' the way of the bed or lower die, and for holding said plunger in its raised position without stopping the running-wheel or pulley that drives the operatingshaft ofthe press, said device requiring nofsupport outside of the driving-pulley, and being at once simple, eilicient, and durable.

The invention also consists in a novel arrangement of the pitman which operates the plunger or mandrel within V-shaped slides or cheeks formed on the latter, and so that said pitinan is free to work within the mandrel-box or guide that carries bushes for the V- slides to play through, with means of adjustment.

By this arrangement a longer pitman for a given height of. press may be secured, and a steadier action generally effected, with every facility for tightening or packing up the sliding mandrel.

Referring to the accompanying drawing-- A is the table or bed ofthe press, and B the frame thereof.

O is the sliding mandrel or plunger, having sides or cheeks b l), the front and back edges of which are made to form V-shaped slides, which it within and play through bushes D D and corresponding opposite ones, D', of a mandrel-box or guide, E, the front bushes D D having a loose or free tit, and being made adj ustable, or capable of being set up from time to time, by means of set-serews c c. lhis forms a simple and efficient arrangement yfor adjusting the mandrel to meet wear, or as circumstances may require.

Said mandrel O is operated by a pitman, F, pivoted,

as at (Z, within the V-shaped slides or cheeks' b, andl with freedom to play through the mandrel-box or guide E, which latter is secured to the main frame.

By this arrangement a steady action is secured for the mandrel, and a longer pitman may be used for a given height of press than where-the pitman is not at liberty to play through the guide. h.

G is the operating-shaft, designed to rotate as indicated by thev arrow-w, and serving to give 11p-anddowu motion, by means of a crank or eccentric, to the pitman F.

H is the driving-pulley, hung, in a free .or loose manner, on an overhanging portion of the shaft G, and made capable of gearing therewith, as required, inthe following-manner, and so that either driving motion may be communicated to the shaftG,.-0r the `vlatter' be stopped to arrest the mandrel or plunger at its top stroke for facilitating clearance of the work, or access 'to the dies ofthe press, without stopping the running of the pulley H.

The overhanging portion of the shaft G has a longitudinal semi or partially-circular groove, c, made in it, the circle of which groove is completed through the diivingpulley H, and an inner arranged disk, I,.which is fast on the shaft G.

Fittingthis groove is a key or plug, J', of a full circular form, where it passes through the disk I, but cut away or reduced, as at f, where it is extended beyond the disk, or passes through the wheel H.

v On the inner end ot this key, which is made capable of being turned within the groove e, is an arm or lever, K, acted upon at its back by a spring, g, that serves to throw said lever in driving contact with or against a projection, L, on the face of the disk I, and,

at the same time, or by such adjustment of the lever K, causes the reduced portion f of the key J to be turned into driving-gear with the grooved portion of the pulley H, as shown in fig. 2,'and whereby said pulley is made to rotate the-shaft G.

On holding` back the lever K, however, against the action of the spring g till arrested by a stop, h, which turns the key J, so that the reduced port-ion of it lies wholly within the shaft G, as represented in iig. 3, then the pulley H is free to rotate without driving the shaft G.

To thus arrest the motion of the shaft G without stopping the pulley H, a stop-lever, M, that may be under the control of a spring, N, and treadle, O, is lowered or adjustedso that the outer or projecting end of the lever K in coming round strikes it, which causes said lever to be worked back, and, with it, the key J to be turned so that its reduced portion f does not project into the groove in the pulley H, whereby Vthe latter is free to rotate without driving the shaft Gr, the outer surface ot' such reduced portion preferably being convex, and of the same curvature as the shaft, by which construction said reduced portion aids, when adjusted as last described, toform, in common with the shaft, a bearing for the pulley.

The stop-lever M is so arranged as to trip or draw back the lever K when the `plunger or mandrel G appreaches Ithe extremity of its Aup stroke, so as to arrest the motion of' the mandrel at the end ofV such stroke.

A trip-motion thus constructed requires no bearing.

out/sident' or` beyond the driving-pulley, is simple, eicient, and durable, may be operated without-a spring to establish the 'disconnection of the driv'ingpulley and shaft it serves tc operate, and, when adjusted to .gearthese devices, constitutes a direct and 'positive connection between them.

4 What is here claimed, and desired to be secured by Letters Patent, is-

1. The `combination of the key or plug J, formed with a reduction, j', and made capable of tuming, as described, the shaft G, having'a groove, c, in it, the

lever K, thedisk I, with its projection L, and the trip. or stop-lever M, substantially as speciled.

'2. The combination-of .the pitman F, arranged within the cheeks 0r sides 1111 -of the mandrel C, and relatively to the b'ox or guide E, for operation therethrough, and the bushes D D', made to lit-the V-shaped edges of the cheeksv b b, essentially as shown and described.

ALBERT HAMLIN.

Witnesses FRED. HAYNES, FERD. '.IUscH. 

